Boom-sheet buffer.



PATENTED AUG. 8, 1905.

C. A. MARR.

BOOM SHEET BUFFER.

APPLIoATIoN FILED JUNE a, 1904.

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PATENT oEEIcE.

CHARLES A. MARR, OF GLOUCESTER, MASSACHUSETTS.

BOOM-SHEET BUFFER Specification of Letters Patent.

Patented Aug. 8, 1905.

Application filed June 8, 1904. Serial No. 211,654.

` Gloucester, in the county of Essex and State of Massachusetts, have invented certain new and useful Improvements in Boom-Sheet Buffers, of which the following is a speciiication.

This invention relates to buffers which are used to cushion the boom-sheet and ease the shock or jar resulting from the arrest of the sheet when the boom swings over from one side of the mast to the other.

The invention has for its object to provide certain improvements in buffers of this character looking to increased ei'liciency of operation, durability, and general desirability.

The invention consists in the improvements which I will now proceed to describe and claim.

Of the accompanying drawings, forming a part of this speciiication, Figure l represents a side elevation of a boom-sheet buffer embodying my invention. Fig. 2 represents a top plan view of the same. Fig. 3 represents a section on line 3 3 of Fig. 2. Fig. 4 represents an end view of one of the collars shown in the preceding figures. Fig. 5 represents a side view of the cross-bar which forms a part of the collar shown in Fig. 4. Fig. 6 represents a perspective sectional view of one of the parts.

The same characters of reference indicate the same parts in all the figures.

In the drawings, a a represent eyebolts, which are rigidly xed to the taffrail of a vessel.

b represents a stout rod, the end portions of which are passed through the eyebolts a, and provided with nuts b', which are turned up against the outer sides of the eyebolts, the rod being, therefore, firmly supported above and parallel with the taifrail.

c c represent metal collars, which are slidingly mounted on the rod b in close proximity to the eyebolts a a, the outer ends of said collars normally bearing against the eyebolts.

Between the collars c c and supported by the bar b is a series of buffer-springs d, which are preferably made of elastic rubber and of annular form. In this -embodiment of my invention the springs d are separated from each other by metal washers e e and e, which are slidingly mounted upon the rod b. The washers e are relatively narrow, while the central washer e is preferably considerably elongated to serve as a support for the ring f, hereinafter referred to.

Each collar c is composed of a body portion 2, of cast-iron, and a cross-bar 3, of wrought-iron. The said cross-bar is formed before the casting of the body portion, the latter being cast around the central portion of the cross-bar. In casting the body portion 2 an orifice 4 is formed therein for the reception of the rod l), the cross-bar 3 having a coinciding orice' for the same purpose. The cross-bar 3 extends across the center of the collar c, and its end portions 30 30 project from opposite sides of the collar c and are formed as trunnions.

frepresents a ring which is engaged with the boom-sheet. Said ring is located in close proximity to or in contact with the central washer e/ and is connected with the trunnions ted through the described connections to one of the collars c, the latter being permitted by the buiifer-springs to yield, so that the arrest of the boom is not attended by a destructive shock.

My invention resides in the above described construction of the collars c and their trunnions and in the arrangement of the trunnions in alinement with each other and projecting in opposite directions from the center of the collar c. By forming the said collar with a cast-metal body and a wrought-metal l crossbar, which includes the trunnions 30 and has the body cast around it, I provide a collar having suitable bulk and length to slide freely on the rod without liability of cramping or binding and has at the same time sufficient strength to resist the strains exerted by the boom through the described connections, the whole construction being relatively inexpensive. The location of the trunnions at o posite sides of the center of the collar enab es the strain exerted on the collar by the boom to be directed approximately lengthwise of the rod b. Hence the liability of springing the central portion of the rod upwardly is obviated.

The springs d may be considered as springsections, and considered collectively they constitute a buffer-spring.

I claim- 1. A boom sheet buffer comprising a straight rod or guide, means for sup orting the same, a pair of collars iitted to side on the rod each having a pair of trunnions projecting in opposite directions from the center of the collar, a buffer-spring mounted on the rod between the collars, a boom-sheet-cngaging member located between the collars at one side of the spring, and straight-rod connections between said member and the collar-trunnions.

2. A boom sheet buffer comprising a straight rod or guide, means for supporting the same, a pair of collars itted to slide on the rod each having a pair of wrought-iron trunnions projecting in opposite directions from the center of the collar, a buffer-spring mounted on the rod between the collars, a boom-sheet-engaging member located beon the rod between the collars, and means for connecting said trunnions with a boomsheet. y

In testimony whereof I have aHiXed my signature in presence of two witnesses.

CHARLES A. MARR.

Witnesses:

RICHARD C. STEELE, GEORGE STEELE, Jr. 

